The given diagrams, I and II, show the growth of a plant without and with hormone treatment. Based on the shown effect in diagram II, the hormones used in the mixture must be
Correct answer: B. Auxin and Gibberellin
- A. Ethene and Auxin
- B. Auxin and Gibberellin
- C. Abscisic acid and Ethene
- D. Gibberellin and Abscisic acid
Explanation
The correct answer is Option B: auxin and gibberellin. These two hormones are known to promote plant growth by stimulating cell elongation and division. In the context of the diagrams, this combination would result in enhanced growth as shown in diagram II. Other options are incorrect because they include hormones like abscisic acid, which inhibits growth, or ethene, which primarily affects fruit ripening and leaf abscission rather than growth promotion.
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About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
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